I'm confused. A nun told you it is your duty to have children?
I thought nuns had taken vows of celibacy? Or possibly a strong commitment to chastity if you don't want to use the term vow.
There are many things I agree with catholics about and plenty that I don't. A lot of times I think it's a heart issue to my disagreements (as well as certain doctrinal issues that are irrelevant to the topic). Pharasaical legalism is the biggest disagreement in terms of procreative "duty". Certainly it is a "commission" of sorts in scripture but one can also be barren, widowed, a eunuch, or consecrate themselves to the Lord. This is not just a personal decision but the Lord's decision...I personally feel like it will be clear enough what his will is. Who though...that's a different story altogether
I do agree that procreation is an "aspect" of marriage but isn't the sole element. Not sure what they say about that though. Pretty sure it's a sacrament right?
If you burn, marry. If not, no worries. Seems simple enough...if you have a "drive" it seems simple enough that it's on the table. Not a veritable certainty...I do think you have to make a choice. For some it falls together neatly and others it does not. Being single and unmarried my views are subject to change about the "how" ofc ha.
That other stuff sounds like something you need to pray about. Plenty of people don't get married because of hang ups and if you REALLY didn't want children you could wait until after menopause.
I know someone that seemed to be entirely devoid of patience and when she was unexpectedly pregnant (leastways I didn't think the timing was planned). From my view she has a large well-spring of patience I had no idea she had.
Motherhood has a mysterious effect so don't discount that.
I think a husbands decision should be factored into any discussion on procreation of course...kind of a linchpin.